Are you a member of RWA? If not I would say the first step is to join and network with your local chapter. They have tremendous organization and business acumen.
Litgal is spot on.
There are also R&R (read & review) subgroups within the popular reading groups on Goodreads. You can troll through your favorite authors' GR author pages and then look to see if their readers who have left reviews are a member of any specific romance reading group. Join the group and then check out the group's R&R subgroup and policies.
DISCLAIMER: we haven't done this, but we know it's one way to garner reviews.
If you're going to self-publish, you can actually make your book "permanently" free on Amazon (and other distribution channels) for the first two or three weeks, and simply gain reviews by gaining a ton of new readers.
Within the romance genre, if you have the right keywords and cover, and you're making your book free soon after you publish it, you will easily score 1000-3000 free downloads per day. That should get you about 15 reviews -- at least -- after a few weeks. After you feel you have enough reviews, you can always flip the price back to paid by changing the price on all the non-Amazon distribution sites.
*NOTE: you can't actually set your price permanently free on Amazon.com. You have to set it to 0.99 and then you set it to free on Apple, Kobo, B&N, etc. and then Amazon will price match to free. This is a very popular strategy amongst indie self-publishers, but most fail to realize that it's pretty easy to flip your book back to paid whenever you want.
OR if this sounds too complex, you can simply enroll your book in Amazon's KDP Select/Kindle Unlimited program and they give you 5 free days every 3 months for marketing purposes.